<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="" />
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出登录</el-button>
        </el-header>
        <!-- 下面区域 -->
        <el-container>
            <!-- 左侧边栏 -->
            <!-- 将侧边栏的宽度设置为动态的 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <!-- 折叠按钮 -->
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单 -->
                <!-- unique-opened前面要加上冒号才能绑定布尔值，不然就是字符串 -->
                <!-- 或者只写一个 unique-opened，表示将这值设置为true -->
                <el-menu
                    background-color="#333744"
                    text-color="#fff"
                    active-text-color="#409EFF"
                    :unique-opened="true"
                    :collapse="isCollapse"
                    :collapse-transition="false"
                    router
                    :default-active="activePath"
                >
                    <!-- 一级菜单 -->
                    <!-- 将number的类型转换为string -->
                    <el-submenu
                        :index="item.id + ''"
                        v-for="item in menuList"
                        :key="item.id"
                    >
                        <!-- 一级菜单的模板区域  -->
                        <template slot="title">
                            <!-- 图标 根据iconsObj对象获取对应的图标-->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{ item.authName }}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <el-menu-item
                            :index="subItem.path"
                            v-for="subItem in item.children"
                            :key="subItem.id"
                            @click="saveNavState(subItem.path)"
                        >
                            <!-- 二级菜单的模板 -->
                            <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{ subItem.authName }}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 主体区域 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data() {
        return {
            menuList: [],
            iconsObj: {
                125: 'iconfont users icon-users',
                103: 'iconfont icon-tijikongjian',
                101: 'iconfont icon-shangpin',
                102: 'iconfont icon-danju',
                145: 'iconfont icon-baobiao',
            },
            // 是否折叠
            isCollapse: false,
            // 被激活的链接地址
            activePath: '',
        }
    },
    created() {
        // created 是生命周期函数之一，在实例创建完成后被立即调用
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        // 退出登录
        logout() {
            window.sessionStorage.clear()
            this.$router.push('/login')
        },
        // 请求左侧菜单
        async getMenuList() {
            //发送请求，获取菜单内容
            const { data: res } = await this.$http.get('menus')
            console.log(res)
            if (res.meta.status !== 200) {
                return this.$message.error(res.meta.msg)
            } else {
                this.menuList = res.data
            }
        },
        // 点击按钮，切换折叠展开菜单
        toggleCollapse() {
            this.isCollapse = !this.isCollapse
        },
        // 保存链接的激活状态，即：点击了哪个菜单？保存那个
        saveNavState(activePath) {
            window.sessionStorage.setItem('activePath', activePath)
            this.activePath = activePath
        },
    },
}
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}
.el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
    }
}
.el-aside {
    background-color: #333744;
    overflow: hidden;
}
.el-main {
    background-color: #eaedf1;
}
.el-menu {
    // border-right: solid 1px #e6e6e6;
    border-right: 0;
}
.el-submenu .iconfont {
    margin-right: 10px;
}
.toggle-button {
    background-color: #4a5064;
    color: #fff;
    font-size: 16px;
    line-height: 30px;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>